Allow filter the list_index view based on domain
As postorius/mailman3 already support multiple domains, this adds ability to filter the list index based on the current domain that Postorius is served from.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
As postorius/mailman3 already support multiple domains, this adds ability to filter the list index based on the current domain that Postorius is served from.